<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .outer{
            width: 100%;
            border: #ff8500 solid 10px;
            overflow: hidden;
        }

        .inner{
            background-color: #bfa;
            width: 100px;
            height: 100px;
            float: left;
        }

        .box2{
            height: 200px;
            width: 200px;
            background-color: yellow;
        }
    </style>
</head>
<body>
<div class="outer">
    <div class="inner"></div>
</div>
<div class="box2"></div>
</body>
</html>